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x86/unwinder: Handle stack overflows more gracefully
[linux/fpc-iii.git] / drivers / hid / usbhid / usbkbd.c
blobed01dc425d29dbc8890915d6547fd3424e1ae2fc
1 /*
2 * Copyright (c) 1999-2001 Vojtech Pavlik
3 *
4 * USB HIDBP Keyboard support
5 */
6
7 /*
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * Should you need to contact me, the author, you can do so either by
23 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
24 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
25 */
26
27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/usb/input.h>
34 #include <linux/hid.h>
35
36 /*
37 * Version Information
38 */
39 #define DRIVER_VERSION ""
40 #define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
41 #define DRIVER_DESC "USB HID Boot Protocol keyboard driver"
42
43 MODULE_AUTHOR(DRIVER_AUTHOR);
44 MODULE_DESCRIPTION(DRIVER_DESC);
45 MODULE_LICENSE("GPL");
46
47 static const unsigned char usb_kbd_keycode[256] = {
48 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
49 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44, 2, 3,
50 4, 5, 6, 7, 8, 9, 10, 11, 28, 1, 14, 15, 57, 12, 13, 26,
51 27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
52 65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
53 105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
54 72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
55 191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
56 115,114, 0, 0, 0,121, 0, 89, 93,124, 92, 94, 95, 0, 0, 0,
57 122,123, 90, 91, 85, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
58 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
60 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
61 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
62 29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
63 150,158,159,128,136,177,178,176,142,152,173,140
64 };
65
66
67 /**
68 * struct usb_kbd - state of each attached keyboard
69 * @dev: input device associated with this keyboard
70 * @usbdev: usb device associated with this keyboard
71 * @old: data received in the past from the @irq URB representing which
72 * keys were pressed. By comparing with the current list of keys
73 * that are pressed, we are able to see key releases.
74 * @irq: URB for receiving a list of keys that are pressed when a
75 * new key is pressed or a key that was pressed is released.
76 * @led: URB for sending LEDs (e.g. numlock, ...)
77 * @newleds: data that will be sent with the @led URB representing which LEDs
78 should be on
79 * @name: Name of the keyboard. @dev's name field points to this buffer
80 * @phys: Physical path of the keyboard. @dev's phys field points to this
81 * buffer
82 * @new: Buffer for the @irq URB
83 * @cr: Control request for @led URB
84 * @leds: Buffer for the @led URB
85 * @new_dma: DMA address for @irq URB
86 * @leds_dma: DMA address for @led URB
87 * @leds_lock: spinlock that protects @leds, @newleds, and @led_urb_submitted
88 * @led_urb_submitted: indicates whether @led is in progress, i.e. it has been
89 * submitted and its completion handler has not returned yet
90 * without resubmitting @led
91 */
92 struct usb_kbd {
93 struct input_dev *dev;
94 struct usb_device *usbdev;
95 unsigned char old[8];
96 struct urb *irq, *led;
97 unsigned char newleds;
98 char name[128];
99 char phys[64];
100
101 unsigned char *new;
102 struct usb_ctrlrequest *cr;
103 unsigned char *leds;
104 dma_addr_t new_dma;
105 dma_addr_t leds_dma;
106
107 spinlock_t leds_lock;
108 bool led_urb_submitted;
109
110 };
111
112 static void usb_kbd_irq(struct urb *urb)
113 {
114 struct usb_kbd *kbd = urb->context;
115 int i;
116
117 switch (urb->status) {
118 case 0: /* success */
119 break;
120 case -ECONNRESET: /* unlink */
121 case -ENOENT:
122 case -ESHUTDOWN:
123 return;
124 /* -EPIPE: should clear the halt */
125 default: /* error */
126 goto resubmit;
127 }
128
129 for (i = 0; i < 8; i++)
130 input_report_key(kbd->dev, usb_kbd_keycode[i + 224], (kbd->new[0] >> i) & 1);
131
132 for (i = 2; i < 8; i++) {
133
134 if (kbd->old[i] > 3 && memscan(kbd->new + 2, kbd->old[i], 6) == kbd->new + 8) {
135 if (usb_kbd_keycode[kbd->old[i]])
136 input_report_key(kbd->dev, usb_kbd_keycode[kbd->old[i]], 0);
137 else
138 hid_info(urb->dev,
139 "Unknown key (scancode %#x) released.\n",
140 kbd->old[i]);
141 }
142
143 if (kbd->new[i] > 3 && memscan(kbd->old + 2, kbd->new[i], 6) == kbd->old + 8) {
144 if (usb_kbd_keycode[kbd->new[i]])
145 input_report_key(kbd->dev, usb_kbd_keycode[kbd->new[i]], 1);
146 else
147 hid_info(urb->dev,
148 "Unknown key (scancode %#x) pressed.\n",
149 kbd->new[i]);
150 }
151 }
152
153 input_sync(kbd->dev);
154
155 memcpy(kbd->old, kbd->new, 8);
156
157 resubmit:
158 i = usb_submit_urb (urb, GFP_ATOMIC);
159 if (i)
160 hid_err(urb->dev, "can't resubmit intr, %s-%s/input0, status %d",
161 kbd->usbdev->bus->bus_name,
162 kbd->usbdev->devpath, i);
163 }
164
165 static int usb_kbd_event(struct input_dev *dev, unsigned int type,
166 unsigned int code, int value)
167 {
168 unsigned long flags;
169 struct usb_kbd *kbd = input_get_drvdata(dev);
170
171 if (type != EV_LED)
172 return -1;
173
174 spin_lock_irqsave(&kbd->leds_lock, flags);
175 kbd->newleds = (!!test_bit(LED_KANA, dev->led) << 3) | (!!test_bit(LED_COMPOSE, dev->led) << 3) |
176 (!!test_bit(LED_SCROLLL, dev->led) << 2) | (!!test_bit(LED_CAPSL, dev->led) << 1) |
177 (!!test_bit(LED_NUML, dev->led));
178
179 if (kbd->led_urb_submitted){
180 spin_unlock_irqrestore(&kbd->leds_lock, flags);
181 return 0;
182 }
183
184 if (*(kbd->leds) == kbd->newleds){
185 spin_unlock_irqrestore(&kbd->leds_lock, flags);
186 return 0;
187 }
188
189 *(kbd->leds) = kbd->newleds;
190
191 kbd->led->dev = kbd->usbdev;
192 if (usb_submit_urb(kbd->led, GFP_ATOMIC))
193 pr_err("usb_submit_urb(leds) failed\n");
194 else
195 kbd->led_urb_submitted = true;
196
197 spin_unlock_irqrestore(&kbd->leds_lock, flags);
198
199 return 0;
200 }
201
202 static void usb_kbd_led(struct urb *urb)
203 {
204 unsigned long flags;
205 struct usb_kbd *kbd = urb->context;
206
207 if (urb->status)
208 hid_warn(urb->dev, "led urb status %d received\n",
209 urb->status);
210
211 spin_lock_irqsave(&kbd->leds_lock, flags);
212
213 if (*(kbd->leds) == kbd->newleds){
214 kbd->led_urb_submitted = false;
215 spin_unlock_irqrestore(&kbd->leds_lock, flags);
216 return;
217 }
218
219 *(kbd->leds) = kbd->newleds;
220
221 kbd->led->dev = kbd->usbdev;
222 if (usb_submit_urb(kbd->led, GFP_ATOMIC)){
223 hid_err(urb->dev, "usb_submit_urb(leds) failed\n");
224 kbd->led_urb_submitted = false;
225 }
226 spin_unlock_irqrestore(&kbd->leds_lock, flags);
227
228 }
229
230 static int usb_kbd_open(struct input_dev *dev)
231 {
232 struct usb_kbd *kbd = input_get_drvdata(dev);
233
234 kbd->irq->dev = kbd->usbdev;
235 if (usb_submit_urb(kbd->irq, GFP_KERNEL))
236 return -EIO;
237
238 return 0;
239 }
240
241 static void usb_kbd_close(struct input_dev *dev)
242 {
243 struct usb_kbd *kbd = input_get_drvdata(dev);
244
245 usb_kill_urb(kbd->irq);
246 }
247
248 static int usb_kbd_alloc_mem(struct usb_device *dev, struct usb_kbd *kbd)
249 {
250 if (!(kbd->irq = usb_alloc_urb(0, GFP_KERNEL)))
251 return -1;
252 if (!(kbd->led = usb_alloc_urb(0, GFP_KERNEL)))
253 return -1;
254 if (!(kbd->new = usb_alloc_coherent(dev, 8, GFP_ATOMIC, &kbd->new_dma)))
255 return -1;
256 if (!(kbd->cr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
257 return -1;
258 if (!(kbd->leds = usb_alloc_coherent(dev, 1, GFP_ATOMIC, &kbd->leds_dma)))
259 return -1;
260
261 return 0;
262 }
263
264 static void usb_kbd_free_mem(struct usb_device *dev, struct usb_kbd *kbd)
265 {
266 usb_free_urb(kbd->irq);
267 usb_free_urb(kbd->led);
268 usb_free_coherent(dev, 8, kbd->new, kbd->new_dma);
269 kfree(kbd->cr);
270 usb_free_coherent(dev, 1, kbd->leds, kbd->leds_dma);
271 }
272
273 static int usb_kbd_probe(struct usb_interface *iface,
274 const struct usb_device_id *id)
275 {
276 struct usb_device *dev = interface_to_usbdev(iface);
277 struct usb_host_interface *interface;
278 struct usb_endpoint_descriptor *endpoint;
279 struct usb_kbd *kbd;
280 struct input_dev *input_dev;
281 int i, pipe, maxp;
282 int error = -ENOMEM;
283
284 interface = iface->cur_altsetting;
285
286 if (interface->desc.bNumEndpoints != 1)
287 return -ENODEV;
288
289 endpoint = &interface->endpoint[0].desc;
290 if (!usb_endpoint_is_int_in(endpoint))
291 return -ENODEV;
292
293 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
294 maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
295
296 kbd = kzalloc(sizeof(struct usb_kbd), GFP_KERNEL);
297 input_dev = input_allocate_device();
298 if (!kbd || !input_dev)
299 goto fail1;
300
301 if (usb_kbd_alloc_mem(dev, kbd))
302 goto fail2;
303
304 kbd->usbdev = dev;
305 kbd->dev = input_dev;
306 spin_lock_init(&kbd->leds_lock);
307
308 if (dev->manufacturer)
309 strlcpy(kbd->name, dev->manufacturer, sizeof(kbd->name));
310
311 if (dev->product) {
312 if (dev->manufacturer)
313 strlcat(kbd->name, " ", sizeof(kbd->name));
314 strlcat(kbd->name, dev->product, sizeof(kbd->name));
315 }
316
317 if (!strlen(kbd->name))
318 snprintf(kbd->name, sizeof(kbd->name),
319 "USB HIDBP Keyboard %04x:%04x",
320 le16_to_cpu(dev->descriptor.idVendor),
321 le16_to_cpu(dev->descriptor.idProduct));
322
323 usb_make_path(dev, kbd->phys, sizeof(kbd->phys));
324 strlcat(kbd->phys, "/input0", sizeof(kbd->phys));
325
326 input_dev->name = kbd->name;
327 input_dev->phys = kbd->phys;
328 usb_to_input_id(dev, &input_dev->id);
329 input_dev->dev.parent = &iface->dev;
330
331 input_set_drvdata(input_dev, kbd);
332
333 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) |
334 BIT_MASK(EV_REP);
335 input_dev->ledbit[0] = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
336 BIT_MASK(LED_SCROLLL) | BIT_MASK(LED_COMPOSE) |
337 BIT_MASK(LED_KANA);
338
339 for (i = 0; i < 255; i++)
340 set_bit(usb_kbd_keycode[i], input_dev->keybit);
341 clear_bit(0, input_dev->keybit);
342
343 input_dev->event = usb_kbd_event;
344 input_dev->open = usb_kbd_open;
345 input_dev->close = usb_kbd_close;
346
347 usb_fill_int_urb(kbd->irq, dev, pipe,
348 kbd->new, (maxp > 8 ? 8 : maxp),
349 usb_kbd_irq, kbd, endpoint->bInterval);
350 kbd->irq->transfer_dma = kbd->new_dma;
351 kbd->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
352
353 kbd->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
354 kbd->cr->bRequest = 0x09;
355 kbd->cr->wValue = cpu_to_le16(0x200);
356 kbd->cr->wIndex = cpu_to_le16(interface->desc.bInterfaceNumber);
357 kbd->cr->wLength = cpu_to_le16(1);
358
359 usb_fill_control_urb(kbd->led, dev, usb_sndctrlpipe(dev, 0),
360 (void *) kbd->cr, kbd->leds, 1,
361 usb_kbd_led, kbd);
362 kbd->led->transfer_dma = kbd->leds_dma;
363 kbd->led->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
364
365 error = input_register_device(kbd->dev);
366 if (error)
367 goto fail2;
368
369 usb_set_intfdata(iface, kbd);
370 device_set_wakeup_enable(&dev->dev, 1);
371 return 0;
372
373 fail2:
374 usb_kbd_free_mem(dev, kbd);
375 fail1:
376 input_free_device(input_dev);
377 kfree(kbd);
378 return error;
379 }
380
381 static void usb_kbd_disconnect(struct usb_interface *intf)
382 {
383 struct usb_kbd *kbd = usb_get_intfdata (intf);
384
385 usb_set_intfdata(intf, NULL);
386 if (kbd) {
387 usb_kill_urb(kbd->irq);
388 input_unregister_device(kbd->dev);
389 usb_kill_urb(kbd->led);
390 usb_kbd_free_mem(interface_to_usbdev(intf), kbd);
391 kfree(kbd);
392 }
393 }
394
395 static const struct usb_device_id usb_kbd_id_table[] = {
396 { USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
397 USB_INTERFACE_PROTOCOL_KEYBOARD) },
398 { } /* Terminating entry */
399 };
400
401 MODULE_DEVICE_TABLE (usb, usb_kbd_id_table);
402
403 static struct usb_driver usb_kbd_driver = {
404 .name = "usbkbd",
405 .probe = usb_kbd_probe,
406 .disconnect = usb_kbd_disconnect,
407 .id_table = usb_kbd_id_table,
408 };
409
410 module_usb_driver(usb_kbd_driver);
Linux with added FPC-III support